<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>level2</title>
    <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
    <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
    <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
    <div class="panel panel-default">
        <div class="panel-body">
            <h1>level2.2.html</h1>
        </div>
    </div>
</div>

</body>
</html>